If you've seen the start of FX's "OJ: Made in America" and all of FX's "The People v OJ Simpson," you may think you know all there is to know about the NFL star-turned-prisoner. But there are still stunning facts that haven't yet aired.

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1. OJ Had 9 Guns
According to Lawrence Schiller's book "American Tragedy: The Uncensored Story of the OJ Simpson Defense": "Juice owned nine guns, including an Uzi."

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The guns were one reason Simpson friend Robert Kardashian didn't believe Simpson killed Nicole, who was killed with a knife, Schiller writes: "A knife didn't fit into any scenario Kardashian could imagine."

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2. OJ Dreamed About Killing Nicole
Ron Shipp (pictured), the LAPD cop and Simpson associate featured in "Made in America," testified that OJ Simpson told him after Nicole Brown's death that he had dreamed about killing her.

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Simpson's attorney, Carl Douglas, later got Shipp to admit under oath that he was more like one of Simpson's "servants" than a friend. (The dream comes up in Episode 3 of "Made in America.")

3. There Were Two OJs
We learned in "People v OJ Simpson" that there were two white Broncos. But did you know there were two OJ Simpsons held in the Nevada prison system?

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The other OJ Simpson -- who is now out of prison --weighed 300 pounds. This may have contributed to the false rumor that the original Simpson ballooned behind bars. (He weighed 225 in May 2016, according to prison officials, up from 210 at the time of his June 1994 arrest.) This image is his May 2016 mug shot.

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4. OJ Was Jealous of... Kato
The reason Kato Kaelin was living with OJ Simpson, according to Jeffrey Toobin's "The Run of His Life," is that Kaelin had formerly been a tenant in Nicole Brown Simpson’s guest house. When Nicole moved into a new home, she intended for Kato to move in and help babysit her kids.

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Simpson objected to Kato living under the same roof as his ex-wife, so he let him stay in his guest house.
“OJ’s offer thus simultaneously removed a potential rival for Nicole’s affections and took money out of his ex-wife’s pocket,” Toobin wrote.

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Come on: Who wouldn't be a little jealous of this guy?

"The People v OJ Simpson"

5. OJ's Son Did It (Attacked His Dad's Statue, That Is)
Simpson’s son, Jason, once took a bat to OJ’s statue of himself. Jason said in a deposition that he wasn’t mad at his dad: “I wanted a party, and I was gonna throw a party, and I got busted. My dad found out that I was going to have a party that night. He said I couldn’t have a party.”